工程车辆自动变速控制系统仿真与试验

Study on Automatic Transmission Control System for Construction Vehicle

对液力机械传动工程车辆遇到高强度载荷效率下降的问题进行了研究,推导了新的换挡规律。按照预先设定的经济型换挡规律,利用推导出的不同挡位下换挡点的通用公式,可将变矩器的效率限定在某一理想范围内。获取对换挡离合器执行机构的控制来达到对离合器油压的控制目的,仿真结果表明其跟踪效果良好。通过台架试验,取得了满意的效果。

Aiming at the problem that the transmission efficiency of construction vehicle hydraulic torque converter will decrease under the instantaneous high strength load, theoretical study on the automatic transmission of construction vehicle is conducted. A new shift schedule was deduced. According to the economical shift schedule, the efficiency of the torque converter can be restricted in an optimal range by the universal formula based on the diverse shift. Through the establishment of different control strategies for different phases of oil control curve for the shift course, to exert fully the function of adjusting the controller for oil pressure, the simulation results indicates that the method of fuzzy control adopted to control high speed on-off valve could adapt to the change of the system structure and adaptively adjust the control parameters. The tracking effect is very good, and it can achieve the aim of improving the shift quality. A satisfactory result was obtained through the test bench evaluation.